<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <style>
    div{
      color: red;
    }
    #p1{color: blue}
    p{color: green !important;}

  </style>
</head>
<body>
  <div>
    这是div
    <p id="p1">这是p标签</p>
    <span>这是span</span>
    <a href="">超链接</a>
  </div>
</body>
</html>